Speed of sound in air is _______km/h?
Speed of sound in air is _______km/h?
A. 1347
B. 243
C. 1235
D. 1495
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The distance between the optical centre of a convex lens and its principal focus is called its_______?
The distance between the optical centre of a convex lens and its principal focus is called its_______?A. Focal Length
B. Radius of Curvature
C. Power
D. MagnificationThe distance between the optical centre and principal focus of a lens is called focal length. Focal length of a lens depends on the refractive index of the glass and its curvature.
Cataract is a disease of ________?
Cataract is a disease of ________?A. Eyes
B. Throat
C. Lungs
D. Circulatory systemChemical Name of Dry Ice?
Chemical Name of Dry Ice?A. Solid Carbon Dioxide
B. Calcium Carbon
C. A&B
D. Sodium OxideChemical name of vinegar is _____________?
Chemical name of vinegar is _____________?
A. Sodium Nitrate
B. Dilute acetic acid
C. Chloride of lime
D. Calcium
E. None of theseVitamin A is found in the____________?
Vitamin A is found in the____________?
A. Green vegetables
B. white vegetables
C. Yellow vegetables
D. Red vegetablesWhat percentage of earth’s water supply is fresh water___________?
What percentage of earth’s water supply is fresh water___________?A. 3%
B. 5%
C. 21%
D. None of these